Gas permeability chamber



Feb. 23, 1965 P. o. KARLQWICZ 3,170,319

' GAS PERMEABILITY CHAMBER Filed Nov. 30, 1960 INVENTOR. I PETER 0.KARLowlcz nnpamgy; x

3,170,319 GASPERMEABILITY GHAMBER Peter 0. Karlowicz, 4911 Highee St,Philadelphia, Pa.

Filed Nov. 30, 196i), der. No. 72,811 V 3 Claims. (Cl. 73-38) (Grantedunder Title 35, 11.8. Codet1952), sec. 266) The invention describedherein may be manufactured and used by or for the Government forgovernmental purposes Without the payment-to me of any royalty thereon.i

This invention relates to an apparatus with which the permeability ofspecimens. (frequently of'metal and made by a powder metallurgy process)maybertested. It has I for an object to provide such an apparatus inwhich the desired test may be made more quickly and easily than has,been customary heretofore.

art has been the necessity for tightening and releasing a plurality ofclamping screws for the assembly and removal of a test specimen. Anotherdithculty has been in obtaining the proper alinernent of the'testspecimen between the clamping members when performed expedi tiously. Afurther disadvantage in some of the prior apparatus has been thenecessity for deforming the neces- 3,l7,319 Patented Feb. 23, 1965 iceclamping member and the test specimen. This screw may be actuated by aknurled head 22 or in any convenient manner and engages inside threadswithin aframe 23 having four leg portions (three being shown 24, 25, 26)leading to the underside and corners of member 11.

Pressure from screw 21 is applied to pressure distributor 27, alsohaving four'leg portions and leading to the four corners ofthe uppermember 10; Recessed portions 28 and 2'59 of clamping members 10 and 11respectively assist in the proper positioning of the-clamping legportions contiguous each clamping member. As shown in FIG. 2 theclamping members 10 and 11 are ofthe same width as frame 23 and due tothe pressure distributor 27 being alined with screwZl. by the roundedend 300i the screw engaging a similarly rounded recess 31 to assist incentering the distributor with respect to the axis of screw i there islittle if any need for centering the members) One cause of greater timeconsumption under the prior 1 and ll with respect to the frame 23 anddistributor transdowels 32. in upper plate fit in four recesses 33 inlower sary gaskets inapplying pressure to them by rotation of p acontiguous part. Still another trouble in such apparatus has beeninaccuracy and the inability toobtain reproducible results with the samespecimen, due to a leakage of gas, caused by mentioned faults.

According to the present invention these disadvantages have beeneliminated. A single screw-applies the desired pressure equally toopposed clamping members for holding a test specimenbetween them. To'reducethe danger of pressure being applied non-uniformlyvor elsewhere(than intended these opposed clamping members holding. a the work haverecessed portions in which leg applying pressure to the outside of eachare accurately positioned.

Four dowels in theupper plate fitting in four recesses in the lowerplate prevent sliding or misalignment.

Referring to the drawingf FIG. 1 is a side view showing a preferredembodiment of the present invention.v

FIG. 2 is a view taken oaths left side of ro. 1. Clamping members 10 and11 have the test specimen kets 14 and 15 have ja centralperforationthrough which gas is supplied or vented from they specimen 13. Therecessed portions 29 in member 11 are not so deep as been ;-'customary.'The cut-outlportion 12, as depicted in the drawings, is centrallydisposed withinmember 1'1 13 held between them in a cut-out portion 12of one memher to insure'itsi beingpositioned where desired. Gasor bottomplate to insure perfect alignment and prevent 7 any sliding of plates. Y

I claim: l. A gas permeability chamber for measuring the per meabilityof specimens and comprising an upper clampingmember having recessedportions at its upper part anda lower clamping member having recessedportions at its lower part, said lower clamping member having a.

cut-out portion at its upper part, apair of gaskets sandwichingsaid'specimen all disposed within said cut-out portion, a gas passagewayin each of s'aidclamping members and said gaskets'so aligned'to pass gasgenerally vertically centrally of said specimen, a framevthreaded at itsupper end and having upwardly extending 'legs at its lower end engagingsaid recessed portions of the lower clamping member, a pressuredistributor within said frame and spaced therefrom, said distributorhaving a round recess at its uppermost portion and legs to engage therecessed portions of said upper clamping member, a screw 7 engaging saidthreads at the upperend of said frame for nesting within said roundrecess of said distributor for applying vertical pressure throughthelegs of said frame and distributor-to insure fan air-tight fit; betweensaid clamping members and means for passing gas-through said passageway.

2. The device of claim 1 further characteriiedby 1 doweled fconnectionsin the clarnping members.

3. The device of claim 2 further characterized by, a

1 third gasket mounted between the clamping members i and will be ofsutficient depth to accommodate gaskets 14 l and 15 and the specimen 13to be 'testedtherebetweenf' The cut-out portion 12 will preferably becircularin shape for economy and ease of fabrication.

Instead of a plurality of. screws,-only one screw 21 is providedforapplying pressure to and through each and having aligned holestherewithin for receiving dowels and gas passageway.

ReierencestJited by the Examiner UNITED STATES PATENTS 2,293,084 8/42Sedam f 73-l03 2,667,782 2/54 Shea 7 337 X 2,755,660 7/56 Kammermeyer eta1 .1; 73-38 lSAAC LISANN, Primary Examiner.

1. A GAS PERMEABILITY CHAMBER FOR MEASURING THE PERMEABILITY OFSPECIMENS AND COMPRISING AN UPPER CLAMPING MEMBER HAVING RECESSEDPORTIONS AT ITS UPPER PART AND A LOWER CLAMPING MEMBER HAVING RECESSEDPORTIONS AT ITS LOWER PART, SAID LOWER CLAMPING MEMBER HAVING A CUT-OUTPORTION AT ITS UPPER PART, A PAIR OF GASKETS SANDWICHING SAID SPECIMENALL DISPOSED WITHIN SAID CUT-OUT PORTION, A GAS PASSAGEWAY IN EACH OFSAID CLAMPING MEMBERS AND SAID GASKETS SO ALIGNED TO PASS GAS GENERALLYVERTICALLY CENTRALLY OF SAID SPECIMEN, A FRAME THREADED AT ITS UPPER ENDAND HAVING UPWARDLY EXTENDING LEGS AT ITS LOWER END ENGAGING SAIDRECESSED PORTIONS OF THE LOWER CLAMPING MEMBER, A PRESSURE DISTRIBUTORWITHIN SAID FRAME AND SPACED THEREFROM, SAID DISTRIBUTOR HAVING A ROUNDRECESS AT ITS UPPERMOST PORTION AND LEGS TO ENGAGE THE RECESSED PORTIONSOF SAID UPPER CLAMPING MEMBER, A SCEW ENGAGING SAID THREADS AT THE UPPEREND OF SAID FRAME FOR NESTING WITHIN SAID ROUND RECESS OF SAIDDISTRIBUTOR FOR APPLYING VERTICAL PRESSURE THROUGH THE THE LEGS OF SAIDFRAME AND DISTRIBUTOR TO INSURE AN AIR-TIGHT FIT BETWEEN SAID CLAMPINGMEMBERS AND MEANS FOR PASSING GAS THROUGH SAID PASSAGEWAY.